利用ASTER数据估算肃南山地植被结构特征参数

利用ASTER数据估算了2000年8月26日祁连山区一子流域-肃南山地的植被结构特征参数,包括地表覆被类型LULC以及植被覆盖度fc、叶面积指数LAI、植被高度hc,匹配DEM定量分析了植被分布与高程、坡向的关系,简要分析了其影响因素。研究表明:(1)ASTER遥感数据在祁连山区有较好的适用性,所选参数能较好地从水平和垂直三维空间精细反映该地的植被分布及结构特性;(2)肃南山地的植被重心位于区域西南部沟谷地带,且植被生长类型、结构和地形密切相关,特别是表征植被水平密度的植被覆盖度fc和高程关系明显,指示出植被发育最好的地带位于海拔3300～3500m,fc与坡向也有相关关系,坡向NW325°至NE40°的范围内植被长势最好;(3)水-热-地形三者综合驱动植被空间结构。

Vegetation structure parameters estimated from ASTER remote sensing data for Sunan Mountain

By using ASTER data on August 26,2000,the vegetation structure parameters including surface cover types,vegetation cover fraction,leaf area index and vegetation height were retrieved for a sub-basin "Sunan Mountian" in Qilian Mountains.Then matching with DEM,we quantitatively analyzed the effect of elevation and hillside aspect on vegetation distribution,and gave a brief analysis of its driving factors.The results showed that:(1) ASTER remote sensing data with higher resolution had a better applicability in the Qilian Mountains,the four selected parameters could reflect the three-dimensional distribution and structural characteristics of vegetation reasonably.(2) The vegetation gravity center of Sunan Mountain was located in the southwest valley area,and the vegetation structure was closely related to topography.Particularly,the horizontal density of vegetation,vegetation cover fraction had a good relationship with elevation.It reached peak value at 3300 ~ 3500m height which indicated that the best area of vegetation growth status located on this zone.Vegetation cover fraction was also relevant to aspect,the vegetation grew best in the range of aspect NW 325 ° to NE 40 °.(3) The incorporated water-heat-terrain was the form-mechanism of vegetation spatial structure.